:root{
  --blue:#2B59C3; --bg:#F4F7FB; --text:#1B2333; --sub:#55607A; --card:#FFFFFF; --border:#D9E0EC;
  --link:#2B59C3; --ph-bg:#FFF1C2; --ph-fg:#6B4A00; --ph-bd:#E5B800;
  --memo-bg:#EEF2FA; --warn-bg:#FFF0EE; --warn-fg:#8A2A1E; --head-bg:#2B59C3; --head-fg:#fff;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#12161D; --text:#E8ECF4; --sub:#A3AEC4; --card:#1B212B; --border:#2E3745;
    --link:#8FB0FF; --ph-bg:#4A3B0A; --ph-fg:#FFE18A; --ph-bd:#B38F00;
    --memo-bg:#1F2733; --warn-bg:#3A1F1C; --warn-fg:#FFB4A8; --head-bg:#1B2A4F;
  }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);
  font-family:"Zen Maru Gothic","Hiragino Maru Gothic ProN","Hiragino Sans","Yu Gothic UI","Noto Sans JP","Meiryo",sans-serif;
  font-size:16px;line-height:1.85;overflow-wrap:anywhere}
a{color:var(--link)}
.site-header{background:var(--head-bg);color:var(--head-fg)}
.site-header .in{max-width:860px;margin:0 auto;padding:10px 16px;display:flex;align-items:center;gap:10px}
.site-header a.brand{display:flex;align-items:center;gap:10px;color:var(--head-fg);text-decoration:none;font-weight:700;font-size:1.15rem}
.site-header img{width:36px;height:36px;border-radius:9px;display:block}
main{max-width:860px;margin:0 auto;padding:20px 16px 40px}
article{background:var(--card);border:1px solid var(--border);border-radius:18px;padding:20px 18px}
@media(min-width:700px){article{padding:32px 40px}}
h1{font-size:1.55rem;line-height:1.4;margin:.2em 0 .6em;color:var(--text)}
h2{font-size:1.25rem;line-height:1.45;margin:2em 0 .6em;padding-left:.6em;border-left:5px solid var(--blue)}
h3{font-size:1.08rem;margin:1.6em 0 .4em}
p,ul,ol{margin:.7em 0}
li{margin:.25em 0}
hr{border:0;border-top:1px solid var(--border);margin:1.6em 0}
code{background:var(--memo-bg);padding:.05em .35em;border-radius:5px;font-size:.92em}
.table-wrap{overflow-x:auto;margin:1em 0;-webkit-overflow-scrolling:touch;border:1px solid var(--border);border-radius:10px}
table{border-collapse:collapse;width:100%;font-size:.93rem;line-height:1.6}
.table-wrap.wide table{min-width:760px}
th,td{padding:.55em .7em;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}
th{background:var(--memo-bg);white-space:nowrap}
tr:last-child td{border-bottom:0}
blockquote{margin:1em 0;padding:.8em 1em;background:var(--ph-bg);color:var(--ph-fg);border:2px solid var(--ph-bd);border-radius:12px;font-size:.93rem;line-height:1.7}
blockquote p{margin:.3em 0}
.ph{background:var(--ph-bg);color:var(--ph-fg);border:1px dashed var(--ph-bd);border-radius:5px;padding:0 .25em;font-weight:500}
.memo{background:var(--memo-bg);border-left:4px solid var(--ph-bd);padding:.5em .8em;border-radius:6px;font-size:.9rem;color:var(--sub)}
li.memo{list-style:none}
.warn{background:var(--warn-bg);color:var(--warn-fg);border-radius:12px;padding:.9em 1.1em;margin:1em 0}
.hero{text-align:center;padding:10px 0 6px}
.hero-icon{border-radius:22px;box-shadow:0 4px 16px rgba(0,0,0,.18)}
.hero h1{margin:.4em 0 .2em;font-size:1.9rem}
.lead{font-size:1.08rem}
.cta{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.btn{display:inline-block;background:var(--blue);color:#fff;text-decoration:none;border-radius:999px;padding:.6em 1.4em;font-weight:700}
.small{font-size:.85rem;color:var(--sub)}
details{border:1px solid var(--border);border-radius:12px;padding:.1em 1em;margin:.7em 0;background:var(--bg)}
summary{cursor:pointer;font-weight:700;padding:.6em 0}
details[open] summary{border-bottom:1px solid var(--border);margin-bottom:.5em}
footer{max-width:860px;margin:0 auto;padding:8px 16px 40px;color:var(--sub);font-size:.88rem}
footer ul{list-style:none;padding:0;margin:0 0 .8em;display:flex;flex-wrap:wrap;gap:.3em 1.2em}
footer a{color:var(--link)}